ArcelorMittal Germany has announced that the gas pipeline for the Bottrop coking plant, which had been renovated for more than a year, is back in operation. Altogether the extensive renovation took 14 months after a thermal renovation was completed several kilometers behind the coking plant in November 2021 and physical overload. The pipeline was initially taken out of service. The resulting surplus coke oven gas could not be passed on to industrial customers and had to be flared.Due to its high hydrogen content of up to 60%, the resulting gas contributes as a bridging technology to make the products of processing companies CO2-neutral in the future. The gas is produced as a by-product of the coking process. The Bottrop coking plant needs the pipeline of the KGNR to supply the gas to various customers in the region.The repair of the 7.5 kilometer long gas pipeline between Bottrop, Sturmshof and Gelsenkirchen, Nordstern Park, was a Mammoth project. In addition to the pipeline owner Kokereigasnetz Ruhrm, Uniper was involved. the operator of Pipeline Open Grid Europe, ArcelorMittal, three licensing authorities, the Emschergenossenschaft, the TÜV, various construction companies and the cities of Bottrop, Essen and Gelsenkirchen. The initial 40 excavations were turned into ultimately 73. To make matters worse, the line is partly four meters underground in the Emscherdeich. Because of the strict conditions for flood protection, and several suspected bomb points were sounded out.